Predator Ooze
From Commander 2020 set
Predator Ooze
Creature — Ooze
1/1
Indestructible (Damage and effects that say "destroy" don't destroy this creature.)
Whenever this creature attacks, put a +1/+1 counter on it.
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.